mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 (Mohs scale); Color: Pale orange to deep honey-amber; Luster: Vitreous to waxy/greasy; Crystal System: Trigonal; Cleavage: Perfect rhombohedral in three directions.

Hardness: 3 (Mohs scale)
Color: Pale orange to deep honey-amber
Luster: Vitreous to waxy/greasy

Identified July 14, 2026More mineral →

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Physical properties

Hardness: 3 (Mohs scale); Color: Pale orange to deep honey-amber; Luster: Vitreous to waxy/greasy; Crystal System: Trigonal; Cleavage: Perfect rhombohedral in three directions.

Formation & geological history

Formed through chemical precipitation in sedimentary environments, hot springs, or as a secondary mineral in veins and cavities within igneous and metamorphic rocks.

Uses & applications

Used in the manufacture of agricultural lime, cement, and glass. High-quality specimens are popular for ornamental carvings, tumble polishing, and metaphysical collections.

Geological facts

Orange calcite is often called the 'stone of the mind' by collectors because of its vibrant color. It reacts significantly with dilute hydrochloric acid, which will cause it to effervesce or fizz.

Field identification & locations

Field identification can be done via a scratch test (can be scratched by a copper coin or knife) and its distinct rhombohedral cleavage. Commonly found in Mexico, USA, and Brazil.